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Aluminum Sleeved Barrels

 
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  #8  
Old 12-06-2008, 03:44 PM
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Re: Aluminum Sleeved Barrels

I am about to take delivery of a 7WSM with an aluminum tensioned barrel.
I'll keep you posted.
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  #9  
Old 12-12-2008, 10:51 PM
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Re: Aluminum Sleeved Barrels

I have done a couple of integral 22 silencers on rimfires. I use a tension setup. A rimfire stays in the barrel alot longer than a centerfire. The tension setup helps this. I use like materials though in my construction. I use a .030 precision ground stainless tube and a stainless baffel system. I tighten the crap out of it. I was thinking of a ingegral on a sporter weight barreled hunting rifle. This way you dont worry of POI changes or a real long obstruction in the woods. I can show you a picture of the last one I built and the baffel but it has since been destroyed to try other things. The form 1 thing makes it so. I have the current pistola under construction with the same outside tube using it under tenstion and then a ti compensator that can trade off for a screw on silencer. This way I can go back and forth on different guns. I just wanted to try it. I think it came out cool looking. Let me know what you think. Oh yeah the barrel was 6.75 then there is 2.3 of effective baffel. Makes the whole thing about 9 inches. Also I turned down the barrel to .5 inch and threaded the end for the baffel. The baffel screws on the barrel and pulls the barrel under tension against the shoulder on the end of the baffle. This pistol is actually lighter than the original 6.75 barrel setup by a ways. If you need I can find the other pics when I get home.

.
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  #10  
Old 12-16-2008, 11:24 AM
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Re: Aluminum Sleeved Barrels

I have been an engineer for 30 years.

Bonding two different materials together [with different coefficients of expansion and expecting some heat transfer] is something that is done all time, but you have to know what you are doing.

I would start out by reading up on the subject.

My Majestic Arms 17M2 Lothar Walther steel barrel in an Aluminum shroud has terrible heat transfer. It does two or three holes touching and then sprays holes all over the target.
Maybe you can do better than them.

Last edited by Clark; 12-16-2008 at 11:29 AM.
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  #11  
Old 12-16-2008, 11:54 AM
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Re: Aluminum Sleeved Barrels

Clark,
this is the problem that i thought that might happen when working with high heat calibers, unlike the 22 rimfire. My big concern was the expansion of the aluminum. I dont know how your
barrel was made, but most to date are not epoxied into place, they have an air void between the barrel and alum, the nut pulls the barrel into tension. But no matter i forsee problems with extended shooting like you said. If one was building a hunting rifle where 3 shots would prolly in all likely hood be the most you would ever use at one time this would be fine. The ultralight rifles with the pencil barrels can do this same thing, fire several shots touching, then the third and forth goes astray due to the extreme heating of the thin barrel. More than anything it was a project to see if it could be done sucessfully. ABS carbon barrels are proven to work and would be lighter using carbon over alum. Maybe later this winter i may still make one up just for conversation sake.

Thanks for your input, do you have pics of your rifle?
Dave
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  #12  
Old 12-16-2008, 02:18 PM
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Re: Aluminum Sleeved Barrels

I know that when they bond things in electronics, they know the expansion range of each piece. They know what is bonding them together and it's range of elasticity.

The kinds of problems they have are:
a) The bonding material want to be thin for heat, but thick for stretching.
b) The bonding material choices have thermal conductivity at the expense of elasticity, i.e. the rubbery stuff is like an insulator.
c) You would like to have big parts to get something done, but may be only able to have short parts. If that is a problem over .1" with electronics, imagine the problem over 24" with a barrel. And anything that warps the barrel with heat, wrecks accuracy.
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  #13  
Old 12-16-2008, 07:24 PM
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Location: Nebraska
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Re: Aluminum Sleeved Barrels

Here is my first attempt at an aluminum tensioned tube.






I was experimenting here so I didn't true the receiver before installing the barrel and it was amazing how the bullets would walk right down the target as the barrel heated up. This one was a 7mm SAUM. I have since done 2 more the second in a 6BR and the third in a 6mm Creedmoor. I have not shot the last on yet but the 6BR showed enough promise to do another I abandoned the 6BR because it is a 10 twist barrels and I wanted to shoot heavier bullets than it would stabilize but it did shoot the 87 V-maxes well.


James
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  #14  
Old 12-17-2008, 01:50 AM
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Re: Aluminum Sleeved Barrels

bingo james thats exactly what i was looking for, aluminum sleeve full taper no nut on a savage action. I'm intrigued once again.
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